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UCC28782EVM-030: Current flows when PWMH is low

Kaji@PAN

Mastermind 7155 points

Part Number: UCC28782EVM-030
Other Parts Discussed in Thread: UCC28782, LMG2610

Hello,

I would like to ask you about UCC28782.
I am currently checking the operation using an evaluation board.
The waveform below is the waveform at no load.
PWMH of UCC28782 is always Low under no load. blue waveform.
However, when I measure the current on the high side of LMG2610, I can confirm that the current is flowing. Light blue waveform.
Is the above behavior correct?

Best regards,

0 Harish Ramakrishnan5 6 months ago

TI__Mastermind 21975 points

Hi Kaji-San,

Thank you for the query on UCC28782. I am will get back to you shortly.

Regards,

Harish

0 Harish Ramakrishnan5 6 months ago in reply to Harish Ramakrishnan5

TI__Mastermind 21975 points

Hi Kaji-San,

We checked on the EVM, there is no conduction when PWMH is off as shown in the waveforms below.

There could be some path which leads to the circulating clamp curren across the switch. Could you please check?

Thank you

Regards,

Harish

0 Kaji@PAN 6 months ago in reply to Harish Ramakrishnan5

Mastermind 7155 points

Thank you for your reply.
Could you tell me what each waveform shows?
Best regards,

+1 Harish Ramakrishnan5 6 months ago in reply to Kaji@PAN

TI__Mastermind 21975 points

Hi Kaji-San,

The waveforms are: YELLOW- PWML, RED- PWMH, BLUE- DRAIN VOLTAGE, GREEN- PRIMARY CURRENT

Thank you

Regards,

Harish